Lifting-jack



W. C. ENGELL LIFTING JACK. AFPLICAIION FILED SEPT. I3. 1919.

Patenfed May 25, 1920.

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W. C. ENGEL.

LIFTING JACK. APPLICAHON FILED SEPT. 13, 1919.

Patented May 25, 1920.

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UNITED STATES PATENT OFFICE.

WILLIAM C. ENGEL, OF ST. LOUIS, MISSOURI, ASSIGNOR 0F ONE-THIRD TO EDWARD L. HOHENSTEIN AND ONE-THIRD TO FREDERICK SCHOTT, BOTH OF ST. LOUIS, MIS- SOURI.

LIFTING-JACK.

Application filed September 13, 1919.

To all whom it may concern:

Be it known that I, WILLIAM 0. Emma, a citizen of the United States, and a resident of the city of St. Louis and State of Missouri, have invented a new and useful Improvement in Lifting-Jacks, of which the following is a specification.

My invention relates to lifting jacks, particularly to jacks adapted for raising automobiles; and it has for its principal objects to provide a jack which will have a long lifting stroke, which will support great weights, and which, when released, will go down slowly and evenly. The invention consists principally in the hereinafter de scribed arrangement of levers for giving a long stroke, in a liquid cushion for the lifting post and in the parts and combinations of parts hereinafter described and claimed.

In the drawings which form part of this specification and wherein like reference nu merals indicate like parts wherever they occur,

Figure 1 is a vertical sectional view of a. jack embodying my invention; 1

Fig. 2 is an elevation of the same;

Fig. 3 is a vertical sectional view of a jack embodying my invention in a slightly modified form; and

Fig. 4 is a detail view showing a preferred arrangement of the linkage system of the jack.

On the base 1 of my device is a hollow standard 2 which constitutes a housing for a notched or toothed lifting post 3 arranged to slide or move up and down therein. Near the upper end of the standard is pivotally mounted a hand-lever 1, whose hinged end is bifurcated to straddlesaid standard and a lug or lugs 5 provided therefor on the standard and to which it is pivotally secured by. a pintle 6 that extends horizon tally through the bifurcated arms of the lever 4 and said lug 5. The two branches of the short or bifurcated arm of the handlever 4 are provided with links 7 pivotally connected at one end to said arm and at the other end to another link or links 8 that are pivotall connected to a lug or lugs 9 provided t erefor on the standard. The pin 10 that serves to pivotally connect the two sets of links together extends also through a pawl 11 and serves to pivotally mount said awl on the linkage system so as to be mova le therewith. This pawl inclines up- Specification of Letters Patent.

Patented May 25, 1920.

Serial No. 323,640.

wardly and has a tooth or lug 12 that proj ects through a vertical slot provided therefor in the standard so as to normally engage a notch or tooth 13 in the side of the lifting post, being kept in such engagement by the weight of the pawl. The free end of the pawl has a second projection 14 that extends upwardly outside of the standard in position to bear against and cooperate with a spring actuated detent or locking pin 15 when the pawl approaches the upper limit of its stroke. This detent or locking pin 15 is slidably mounted to move horizontally in a bore provided therefor in a boss 16 near the upper end of the standard 2 in position to normally enga e a tooth or notch 18 in the lifting post. Thus, the liftingpost can not drop back until the locking pin has been disengaged from the notch in the post. The locking pin has a downwardly extending projection 17 in position for the upwardly extending projection 14- on the lifting pawl 11 to bear against, one of said projections having an inclined bearing surface disposed to bring about a retractile movement of the locking pin to disengage it from the lifting post. The locking pin is also provided with a handle 30 by which it can be disengaged from the lifting post.

A cylinder or chamber 18 adapted to contain oil or other liquid is conveniently located adjacent to the hollow standard 2. The chamber is provided with a pet cock 19. A channel 20 at the bottom of this liquid chamber communicates with the lower portion of the interior of said hollow standard. As the lifting post is raised, the liquid flows from the cylinder or liquid chamber into the hollow standard. A washer 21 at the bottom of the lifting post prevents the liquid from rising above the bottom of the post. A rod or valve stem 22 in the liquid cylinder has a tapered end or valve 23 adapted to fit the tapered opening '24 of the channel. The rod 22 projects above the cylinder and has a broadened head portion 25. A helical spring 26 on the rod between the head and the liquid chamber keeps said rod normally raised so that the tapered end 23 is clear of the channel opening 24 and liquid can flow freely. from the chamber into the hollow standard. On the downward. stroke of the hand-lever, a lug 27 provided for the purpose on said hand-lever strikes the head of the rod and depresses it. Near the end of the down stroke of said ha'nd-lever, the end of the rod closes the opening to the channel and prevents the liquid from flowing back into the cylinder. There is thus a liquid cushion supporting the lifting post. When the locking pin is disengaged, this liquid constitutes the sole support of the lifting post. At the end of the upward stroke of the lifting pawl (the downward stroke of the hand-lever), the locking pin is disengaged from the lifting post by the action of the projection 14:.

lVhen the hand-lever is in its lowest position, the tapered end of the valve red closes the channel and the locking pin is disengaged from the lifting post notch. If the hand-lever is raised slightly, the spring on the rod causes it to rise, leaving its seat in the opening to the liquid channel and permitting a slight flow of liquid from the standard back to the liquid chamber while the locking pin is still held out of engagement with the lifting post. The lifting post will then settle down slowly and evenly. The lowering can be stopped at any point, either by further lowering the hand-lever to stop the flow of liquid, or by raising it to permit the locking pin to engage a notch in the lifting post.

In the modification shown in Fig. 3, no liquid chamber is provided. The lifting construction is the same as that hereinbefore described. The locking pin 15 is disengaged from the lifting post notches by the handle 30 thereon. The locking pin and the lifting pawl 11 are modified slightly so that the lifting pawl does not move the locking pin out of engagement with the notch in the post at the end of the upward stroke. Any desired means may be used to prevent the lifting post from lowering too rapidly.

It is obvious that changes may be made without departing from my invention and I do not wish to be limited to the precise construction shown.

What I claim is:

1. A lifting jack comprising a hollow standard, a notched lifting post therein and means for actuating said lifting post, said. means comprising a hand-lever pivotally secured to said standard, a downwardly projecting link having its upper end pivotally secured to the end of said hand-lever, a second link pivotally secured at its ends to said first mentioned link and to the standard, and a lifting pawl operatively connected to said links and adapted to engage a notch of the lifting post.

2. A hollow standard, a notched lifting post therein, a spring actuated detent adapted to engage the notches of said lifting post, and means for actuating said lifting post, said means comprising a lifting pawl engaging a notch of said lifting post, a handlever pivotally secured to said standard, a

link pivotally secured to the end of said hand-lever, a second link secured at its ends to said first mentioned link and to the standard, and a lifting pawl operatively connected to said links and adapted to engage a notch of the lifting post. Y

3. A hollow standard, a lifting post therein, a hand-lever embodying means for rais ing said lifting post, a chamber adapted to contain liquid adjacent to said standard, a passageway connecting said standard and chamber, and means operated by said handlerer to open and close said passageway.

i. A lifting jack comprising a hollow standard, a toothed lifting post therein, a locking pin adapted to engage the teeth of said lifting post, a hand-lever controlled means for actuating said lifting post, a liquid chamber, a passageway connecting the interior of said standard and liquid chamber and means operated by said handlever to open and close said passageway.

5. A hollow standard, a notched lifting post therein, a locking pin adapted to en gage the notches of said lifting post, a handlever embodying means for raising said lifting post, said means comprising a lifting pawl, and a link system operable by said hand-lever to operate said lifting pawl, a cylinder adapted to contain liquid adjacent to said standard, a passageway connecting said standard and cylinder and means operated by said hand-lever to open and close said passageway.

6. A hollow standard, a notched lifting post therein, a locking pin adapted to engage the notches of said lifting post, a hand lever embodying means for raising said lifting post, said means comprising a lifting pawl, and a link system operable by said hand-lever to operate said lifting pawl, a cylinder adapted to contain liquid adjacent to said standard, a passageway connecting said standard and cylinder, means operated by said hand-lever to open and close said passageway, and means operated by said lifting pawl to disengage said locking pin as said passageway is closed.

7. A lifting jack comprising a hollow standard, a notched lifting post therein, a spring actuated locking pin adapted to en gage the notches of said lifting post, a lifting pawl adapted to engage the notches of said lifting post, means for actuating said lifting pawl to raise said lifting post, a liquid chamber adjacent to said standard, a passageway connecting said standard and chamber, means operated by said lifting pawl actuating means to open and close said passageway and means operated by said lifting pawl to disengage said locking pin, said locking pin being disengaged from the lifting post while the passageway is still slightly open.

8. A lifting jack comprising a hollow standard, a lifting post therein, a handlever controlled means for raising said lifting post, a liquid supply, a passageway for said liquid supply opening into said hollow standard and means for opening and closing said passageway.

9. A hollow standard, a toothed lifting post therein, a locking pin adapted to engage the teeth of said lifting post, a handlever controlled means for actuating said lifting post, a liquid supply, a passageway for said liquid supply opening into said hollow standard and means for opening and closing said passageway.

10. A hollow standard, a toothed lifting post therein, a locking pin adapted to engage the teeth of said lifting post, a handlever controlled means for actuating said lifting post, a liquid supply, a link sytein operable by said hand-lever to actuate said lifting post, a passageway for said liquid supply opening into said hollow standard and meansfor opening and closing said passageway.

Signed at St. Louis, Missouri, this 11th day of September, 1919.

l VILLIAM C. ENGEL. 

